symfony-console.php

<?php
require __DIR__ . '/vendor/autoload.php';

use Symfony\Component\Console\Application;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

$commands = [];
$commands[] = (new Command('hello'))
    ->setDescription("Hello")
    ->addOption("name", "N", InputOption::VALUE_OPTIONAL, "Name", "unknown")
    ->setCode(function (InputInterface $input, OutputInterface $output) {
        $name = $input->getOption('name');
        $output->writeln("hello <info>$name</info>");
    })
;

$app = new Application();
$app->addCommands($commands);
$app->run();